Heavy-duty rotary rasps set for power drills, pneumatic tools and grinders. Use for grinding, polishing, carving and burnishing the surface of wood. Ball, Oval, Cylinder, Large and Small Cone, Rotary Rasp Cutter Set Cutter Rasp 1/4 "6mm Shank Drill Bits for woodworking. High quality of product processing, high workmanship, can process a variety of high precision mold cavity. The most commonly used rasp configurations and styles: 1 rods / 4 inch to fit most electric drills. Made of quenched and hardened high carbon steel for long lasting cutting power, makes all your grinding needs easier and more convenient. specification: Material: high carbon steel Shank diameter: 6mm The biggest bit height: about 55mm Package Include: 5 pieces woodworking drills Note: Color may be slightly different due to color calibration of each individual screen. Please allow slight measuring deviation due to manual measurement.